For a long time, ".38 Special Hi-Speed" meant the .38-44 load, but after the advent of the .357 Mag, that load started to wane in popularity, so the commonest loads available were the "midrange wadcutter", a 148 gr or so at about 650-700 fps, and the standard or "service load", a 158-160 lead bullet @ 800-850 fps, which began to be called "high speed" just to distinguish it from the wadcutters. Today's .38 +P loads are usually little more than the older "service level" load, only 1or 2 coming anywhere close to the .38-44. My guess would be that the Llama recommendations are for wadcutters or service ammo.
Is that clear as mud ? Anyway, that's how I've read it after my 50-odd years as a shooter. Others may have different takes.

Larry